2284.     MILLIGAN, W. O., AND HOLMES, J.  X-ray Diffraction Studies in the System CuO-Fe2O3.  Jour. Am. Chem. Soc., vol. 63, 1941, p. 149-150; Chem. Abs., vol. 35, 1941, p. 1336.

        Report of the results of a systematic X-ray study of mixtures of varying composition of cupric and ferric oxides, which were precipitated at 25°, aged under water at 100°, and heated to 1,000°.  The radiograms show no indication of the formation of cupric ferrite on precipitation at 25° or on aging the precipitate at 100°.  In the samples heated to 1,000°, CuFe₂O₄ is formed; it is the only compound formed in the system CuO-Fe₂O₃.